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"Sport Pilot" used to mean any pilot who flew any type of aircraft for sport, with or without training or license. But the United States Federal Aviation Administration (or FAA) has recently redefined the term "sport pilot" to be applied to the new light sport aircraft airmen's certificate for which training and a certain amount of solo flying time are required.
from: http://ezinearticles.com/?Sport-Pilot-Training-Certification&id=414110
